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Partial lunar eclipse in night of 16-17 July

Country can witness a three-hour-long partial lunar eclipse early Wednesday when the Earth will move between the sun and the moon.

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Kolkata: Sky enthusiasts in the country can witness a three-hour-long partial lunar early Wednesday when the Earth will move between the sun and the moon.

The eclipse will begin around 1.31 AM on Wednesday, the research and academic director of Birla Planetarium in the city, Debiprosad Duari, said. The greatest partial when the will look the darkest will be around 3 AM.

Skywatchers should not miss this chance since there will be no proper lunar till 2021,” Duari said.

The celestial phenomenon will be visible entirely from all parts of the country, besides parts of South America, Europe, Africa, Asia and Australia, Duari said. The moon will remain partially eclipsed till 4:29 am on Wednesday. So it is a golden opportunity for the sky enthusiasts in the country as the will be visible almost throughout the night, he said.

On Tuesday night, only a part of the moon will pass the earth’s shadow. Around 3:01 AM on Wednesday, 65% of the Moon’s diameter will be under the shadow of the Earth, Duari said.

Elaborating on the celestial phenomenon, Duari said it takes place only at full moon night, when it, the sun and the earth are in a perfectly straight line. As the sun’s rays fall on the earth, its shadow falls on to a patch of space. When the Moon enters the patch of shadow there is a lunar eclipse.

The patch of the shadow is actually composed of two cone-shaped parts — one nestled inside the other.

The outer shadow or penumbra is a zone where the Earth shadow is partial and blocks some, but not all of the sun’s rays. In contrast, the inner shadow or umbra is a region where the earth blocks all direct sunlight from reaching the moon.

When only a part of the moon passes through the umbra, a partial lunar is seen.

If the entire moon passes through the umbral shadow, then a total of the moon occurs, the research and academic director of Birla Planetarium in the city said. India will witness the next lunar eclipse on 26 May 2021, when it will be a total one, he added. When asked, he said lunar eclipses are completely safe to view with the naked eye.

One does not need a telescope to watch the lunar although a good pair of binoculars will enhance the experience, Duari said.

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